keystone serial hw support hw flow control. This patch enables hw flow control for keystone EVMs as an optional feature based on CONFIG_SERIAL_HW_FLOW_CONTROL.
Signed-off-by: Murali Karicheri m-karicheri2@ti.com --- depends on keystone patch series which is on the list. README | 4 ++++ drivers/serial/ns16550.c | 6 ++++++ include/ns16550.h | 1 + 3 files changed, 11 insertions(+)
diff --git a/README b/README index 63c2dba..85c0076 100644 --- a/README +++ b/README @@ -711,6 +711,10 @@ The following options need to be configured: boot loader that has already initialized the UART. Define this variable to flush the UART at init time.
+ CONFIG_SERIAL_HW_FLOW_CONTROL + + Define this variable to enable hw flow control in serial driver. + Current user of this option is drivers/serial/nsl16550.c driver
- Console Interface: Depending on board, define exactly one serial port diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 8a13454..f26979d 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -33,6 +33,12 @@ #if defined(CONFIG_K2HK_EVM) #define UART_REG_VAL_PWREMU_MGMT_UART_DISABLE 0 #define UART_REG_VAL_PWREMU_MGMT_UART_ENABLE ((1 << 14) | (1 << 13) | (1 << 0)) +#undef UART_MCRVAL +#ifdef CONFIG_SERIAL_HW_FLOW_CONTROL +#define UART_MCRVAL (UART_MCR_RTS | UART_MCR_AFE) +#else +#define UART_MCRVAL (UART_MCR_RTS) +#endif #endif
#ifndef CONFIG_SYS_NS16550_IER diff --git a/include/ns16550.h b/include/ns16550.h index 51cb5b4..17f829f 100644 --- a/include/ns16550.h +++ b/include/ns16550.h @@ -100,6 +100,7 @@ typedef struct NS16550 *NS16550_t; #define UART_MCR_OUT1 0x04 /* Out 1 */ #define UART_MCR_OUT2 0x08 /* Out 2 */ #define UART_MCR_LOOP 0x10 /* Enable loopback test mode */ +#define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS */
#define UART_MCR_DMA_EN 0x04 #define UART_MCR_TX_DFR 0x08